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We examined 1,065 shock-deformed quartz grains from five Cretaceous/Tertiary (K/T) boundary sites in the Raton Basin, Colorado, and New Mexico, with cathodolum-inescence (CL) petrography. When grouped into general CL color categories, Raton Basin grains were 37.4 percent brown and 62.6 percent blue. Brown CL is thought to be associated with quartz from low-grade metamorphic rocks, so more than one third of the shocked grains were from this rock type. Almost all the blue CL quartz was medium to dark blue, broadly corresponding to quartz derived from intrusive igneous and high-grade metamorphic rocks.

These data support the conclusions of a study...

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